Reversing gearing



Sept. 10, 1929. H. A. TUTTLE REVERSING GEARING Filed April 1927 2 Sheets-Sheet 1 y wno NN R R Y ma f 147 r 9w A \Q E m fl Q Q. 3. 1.. Q; m .1. e 0 v m l1 w n W/ \W, I =m W M N 9 I mm Q 7 Sept. 10, 1929. ATUTTLE 1,727,624

REVERS ING .GEARING Filed April 1927 2 Sheets-Sheet 2 Patented Sept. 10, 1929. 1 i i 1 5229524 UNITED STATES; PATENT OFFICE. I HENRY As TUTTLE, or nr'roiv, nAssAcHUsE'rrs. I I i BEVERSING GEA ING. y I Application filed hpr il 4, 1927. Serial No.1 80,706.

This invention relates to reversing gearroller, associated with the pinion gear is a inc and -s oecifically to earing of the type separate element. p a comprising aligned di iving and drlven Fig. 6 is similar to F g. except that both shafts With planetary gearing elements in rollers pare'loose on the pinion gear.

5 eluding intermeshing pinion and internal "The invention here shown applied to '5 (rears connecting the shafts for reverse drive the reversegearing illustrated n my above End clutch mechanism connecting the shafts named application and includes aligned for forward drive. driving and driven shafts 1 0 and 12; r 'A In reversing gearing 'of this type, the ingear carrier surrounds the ends of thejdrivternal gear is usually engaged by a brake mg and driven shaftsandcomprises anout- 6 band which is adapted to hold the internal standing circular plate 1 4 whlchha 'a b hgear stationary and set the gearing for re 111g 16 freely rotatable on thedrivenshaft. verse drive and, inengaging, it has a ten- Said plate 1s prov ded with axially-extended dency to move the internal gear slightly circumferentially-spaced ntegral lugs 18 in transverselv of the shafts, thereby to cause theouter periphery thereof which lugs are 65 the pinion gears to mesh With the teeth of ln g l -W h ,1'1ng 2O at their outer ends. the internal gear deeperthan is designed, e s of meshing plnlongears 22 and 24 are thus causing undue stresses and wear on the d SD' Q 111 he space be w n Sflld 1 I1g 2 (rear t th I and plate 14 and are 1ournalled onpms 26 a An object of this invention is the proviand 28 respe'ctlvely which are supp0 }d 1 sion of means to hold theinternal gear and sald g and p e Send Inner pl pn planetarv pinions from meshing deeper than g ars 24 are arranged 1n C I S BJIt mesh W1th is designed. j I a spur gear 30 disposed in the space between A further object vof the "invention is the Sand g 20 d Pl 14 n d g tprovision of rolling supports for the in- Q Ph U t0 the l h c T u e ternal gear so arranged as to hold the gear P 1 gears are arranged 111 filohstant in. fixed radial relation with respect to the mesh Wlth an r l ge -W C i planetary pinion gears. rounds the plane ry pinion gears and has a A yet further object is the provision of n extensloh 34 whlchtls dlsposedebout d rolling supports for the internal gear ashas a beefing P t p riphery of the 80 sociated with the planetary pinion'gears. Plate h h h extensloh at h This invention is particularly applicable PPQ d Wh Ch extends about andhas a to the reversing gearing shown in my coin p h p p y P th y g di fi i'ti S i l N 159 544 fil d A flexible brake band '38 enclrcles the outer Januarv 7 1927, wherein the internal gear ph y of 531d mtenlal 3 Whlch thus 85 surrounds and is loose upon the outer pecompnses a brake drum and the P X M riphery of the pinion gear carrier: and a e dsdO of sald brake band at the upperend further obiect of the invention is the pro- 't 'geamng t adaptedfio actuated y f 110mm, SW) mrtq for the freefyin suitable mechanism including the rod 42 to Vlsmn O t compress the band about the internal gear 90 ternal gear which supports are associated to hold it stationary whereby to set e h the P gears tgearing for reverse drive. The. internal Fig. 1 s a SlClGPlGVZLtlOll partly in section is characterized b being Otherwise of reversing gearing embodying the nvenfree for rotaticn at will upon i g can 45 tlon' rier. "A hub 44 is keyed to the driving-shaft 95 Flgst 3 and 4 are sectlohfll along lOand is provided With aradially-out-stand 111193 3 3f!hd of e hmke ing annularifiange 46 which is secured to the band being omitted. I lugs 18 and ring 20 by'means of bolts48 Fig. 5 is a sectional detail of a pinion gear pass d thr u h aid fl g d screw 50 illustrating a construction wherein the threaded ,intofsaid lugs, thereby formingin 9 14 of they gear carrier.

effect an integral structure with said plate 7 Said flange 46 is adapted to extend radially outward beyond the lefthand end face 50 of the internal gear whereby to provide an abutment which holds the internal gear against axial displacementtoward the left.

The internal gear is formed with an annular shoulder 52 teeth 56 which mesh with external gear teeth of a" set-of 'clutfchplat-esl58. A hub 60 is slidably arranged onthe driven shaft 12 and is fixed thereonby a key 62 against inclependentrotation therewith and has external gean teeth 64: which mesh with the internal gear teeth'of a set of clutchplates 66 cooperating with the, aforementioned set of plates. Suitable; operating mechanism in cluding the SllCllIlg sleeve 68 and links 70 serve to efiect the engagement of the clutch platesfandtherebyto connect the-shafts clirectlyf for forward drive and exclude the planetary gearing-elements. The clutch and brake' mechanisms areactuated by means including a common operating lever72 and mechanism so arranged'thatthe clutch and brake? mechanisms can be set in an intermediateiand neutralposition wherein neither isactuated and the driven shaft is thereby free from'positive' drivingconnection with the driving shaft. Y f'Ihe" construction above described is approximately: as shown in my abovenamed C o-pending application.

' IVhen' the brake band is contracted about the brake drum or internal gear, it usually tends to move" the gear transversely ofthe gearingand thus increases unduly the depth ofineshi'ng of the teeth of the internal gears and-the piniongears, and ordinarily such transverse movement has not been prevented since theremust be sufficient clearance between the internal gear and the side walls and peripheryfof the gear carrier'to permit a free running fit between the gear and carri'erand provide for anoil film between both. VVlllle this clearanceis relatively small it is.

} sufficient to permit enough lateral movement of the internal gear to cause the meshing of the gear teeth of the, internal gear more deeply thanis designed. This crowding of the gear teeth exerts undue strains upon the I: teeth and especially the teeth of the pinion gears and unless ithegear' teeth are made a cylindrilonger than is desirable, whereby to keep down the unit pressure, there is a tendency for the teeth to wear rapidly. In accordance with this invention means are provided to prevent thecrowding together of the pinion and internal gears, or the meshing of their teeth beyond the designed amount, whereby to eliminate abnormal stresses and wear on the teeth and thus permit a decrease in the axial length of the gear teeth and consequently of the entire gearing.

In accordance withthis invention, the pinion gears 22 are provided with axially extended hubs'7 l on one side of the teeth thereof which hubs are designed to have a rolling engagement with the inner annular face 76.0f the internal gear. Saidvpinion gears 22 at their opposite ends also are pro vided with hubs 78 which are adapted to have a rolling engagement upon a second annular'face of the internal gear. In the particular design here shown the hub 78 is larger in diameter than the hub 7 4:, and also of the piniongear teeth, so that the internal gear can bewithdrawn from meshing engagement therewith for disassembling purposes. v i

In Fig. 1 the hubs 74 and 78 are intogral with the pinion gear but they can be.

independent thereof and in Fig. 5 the hub 78 is a separate memberand caneither be driven thereon or in loose engagement therewith as may be desired. In Fig. 6 the other, or small, roller 74* is also loose on the pinion gear. I V

The difference in diameters of the hubs 74 and 78, and of the corresponding annular positively connected through the meshing h gear teeth. If desired, other rollers in addi tion to the'hubs 7a and 78 associated with the pinion gears 22 maybe provided as illus tratedin-Figs. 2, 3 and 4 wherein pins 82, similar to pins 26 and 28, carry large rollers 4: and small rollers 86 respectively which engage the faces 80 and 7 6 respectively of the internal gear and function as above described. I claim: ,1. Reversing gearing comprising the com-' bination of driving and driven: shafts,-

planetary gearing connecting said shafts-for reverse drive including a spur gear fixed to one of said shaft-s, pinion gears surrounding said spur gear, an internal gear surrounding said pinion gear and in mesh with some of them, and a brake band in engagement with said internal gear to hold it sta tionary for reverse drive, said pinion gears having extensions on the similar sides thereof which have a diameter that is not greater than the root diameter of said pinion gears and have rolling engagement with said internal gear, said pinion gears also having loose rollers at their opposite similar ends which have a diameter that is not less than the tip diameter of said pinion gears and have rolling engagement with said internal gear.

2. Reversing gearing comprising the com bination of driving and driven shafts, planetary gearing connectingsaid shafts for reverse drive including a spur gear fixed to one of said shafts, pinion gears surrounding said spur gear, an internal gear surrounding said pinion gears and in mesh with some of them, a brake band in engagement with said spurgear to hold it stationary for reverse drive, these pinion gears meshing with said internal gear characterized by having annular hubs disposed on opposite sides of the gear teeth which hubs comprise independently rotatable rollers having independent rolling engagement with said internal gear and providing support therefor.

3. In a gearing mechanism, a planetary pinion gear, an internal gear meshing with said pinion gear, and means to limit the depth of mesh between said gears comprising a large and a small roller associated with said pinion gear on opposite sides thereof having rolling engagement with opposed annular faces of said internal gear, said large roller being rotatableindepend ently of said small roller.

4. Reversing mechanism comprising the combination of driving and driven shafts,

gearing connecting said shafts for reverse drive including a gear carrier fixed to the driving shaft, a spur gear fixed to the driven shaft, planetary gearing elements including pinion gears carried by the gear carrier some of which gears are in mesh with the spur gear, a loose internal gear surrounding said pinion gears and in constant mesh with others of them, said loose internal gear characterized by being free at all times from positive driving connection with said driving and driven shafts, brake mechanism to hold said internal gear stationary for reverse drive including a brake band surrounding said internal gear and contractible into engagement therewith, and supporting large and small rollers for said internal gear associated with and disposed on opposite sides of said pinion gears and having rolling engagement with said internal gear, said floating internal gear be ing free for removal from "the aforesaid relation by an axial movement thereof :in the directionof the small rollers. i

5. Gearing mechanism including a gear carrier having spaced plates with means detachably connecting them, piniongears disposed between and'carried by said plates, a floating internal gear surrounding said pinion gears and disposed between i said plates and engaging them upon axial movement, and rolling supporting means for said internal gear comprising a small roller disposed on one side of a pinion gear, said roller characterized by having a diameter not greater than the root diameter of the pinion gear and having a rolling engagement with said internal gear, and a second the aforesaid relation by an axial move ment in the direction of the small roller and having an internal diameter at the side opposite said large roller which is not less than the internal diameter of that face thereof which is in rolling engagement with said large roller.

6. Reversing gearing including a gear carrier having spaced plates one of which is larger in diameter than the other, planetary gearing elements carried by and disposed between said plates and extended outwardly beyond at least the smaller one of said plates, an internal gear surrounding said gear carrier and gearing elements and forming the closure for the space between said plates and being loose on and closely surrounding both of said plates and having an internal diameter at least as great as the smaller one of said plates, large and small rollers associated with said planetary gearing elements and located respectively beside said large and small spaced plates, and said large roller having its periphery at least not within the periphery of said small plate, the aforesaid arrangement of plates, internal gear and rollers constituting means providing the removal of said internal gear from the aforesaid relation by an axial movement thereof.

7. Reversing gearing comprising driving and driven shafts, a pinion gear carrier having spaced large and small plates connected with said driving shaft, a spur gear connected with said driven shaft, pinion gears carried and located between said plates and within the periphery of said large plate, an

internal gear closely surrounding both of i said plates and meshing with said pinion gears, large and small rollers associated with said pinion gears and located at said large and small plates respectively, said small rollers being located at least not within the periphery of said small plate and said large rollers being located at least not beyond the periphery of said large plate, whereby said internal gear can be removed from the aforesaid relation by an axial movement in the direction of said small rollers.

In testimony whereof I have signed my name to this specification.

HENRY A. TUTTLE. 

